Features: Digital Sound Level Meter: Polarized capacitive microphone responds quickly to large screen digital display multiple functions are measured in real time. Fast/Slow Dual Measurement Mode: FAST/SLOW time input , one-key switch. Detachable Battery Compartment Design: The rear cover can be detachable battery compartment, easy to change. LCD HD Backlight Digital Display: Black and white screen digital display large font reading clearly visible. Compact & Lightweight: Easy to operate with single, portable to carry around. Polarized Capacitive Microphone: Short response time strong anti-interference ability more accurate data acquisition. Wide Applications: It can be used in factory, workshop, school, office, traffic road, and other places that required sound level test. Specifications: Model: HT602B Material: ABS Sound Pressure: Range: 30-130dBA/30-130dBC Accuracy: ±1.5dB (94dB@1KHz); ±5dB (94dB@8KHz) Frequency Response: 30Hz-8KHz Frequency Weighting: A/C weighting Time Weight: FAST 125ms, SLOW 1 sec Analog Bar: Yes Over Range: UL/OL Ambient Temperature: Range: -20~60 (-4~140) Accuracy: 0~45 (32~113); ±1.0; other: ±1.5 Ambient Humidity: Range: 0~99.9% Accuracy: 20%~80%; ±3.0RH; other: ±4.0RH Wet Buib Temperature: Range: -20~60 (-4~140) Accuracy: 0~45 (32~113); ±1.0; other: ±1.5 Dew Point Temperature: Range: -50~60 (-58~140) Accuracy: 0~45 (32~113); ±1.0; other: ±1.5 Backlight: Yes Data Hold: Yes Max/Min: Yes Auto Power Off: Yes Low Battery Indication: Yes Power Supply: 3 * 1.5V AAA battery (NOT included) Safety Rating: EN61326-1 Item Size: 142 * 58 * 28mm / 5.59 * 2.28 * 1.10in Item Weight: 115g / 4.05oz Package Weight: 194g / 6.84oz Package Size: 18.5 * 9 * 5.5cm / 7.28 * 3.54 * 2.16in Package List: 1 * Sound Level Meter 1 * Pouch 1 * User Manual (English)